APPLICATION MANUAL
DC/DC CONVERTER
CONTROLLER
RV5VH SERIES
NO. EA-049-0006
1
DC/DC CONVERTER CONTROLLER
RV5VH SERIES
OUTLINE
Each of the RV5VH series is dual output CMOS DC/DC converter ICs integrating Step-up and inverting DC/DC convert-
ers.
The RV5VH3
series ICs consists of an oscillator, two VFM control circuits, control transistors(EXT switches), a phase
shift circuit, a voltage reference unit, an error amplifier, and voltage sensing resistors. The package for the RV5VH series
is 8pin SSOP(0.65mm pitch), and it is suitable for power supply systems with positive and negative output, such as pager,
PDA, which need power supplies for LCD.
RV5VH1
and RV5VH2
series are able to provide two DC/DC converters, one is a step-up DC/DC converter with
internally fixed output and the other is an inverting DC/DC converter with adjustable output by external resistors. A volt-
age detector with sensing pin is also included. RV5VH3
series are able to provide two DC/DC converters, both of them
require external drivers, DC/DC1, and inverting one, DC/DC2, can be adjustable by resistors.
FEATURES
Dual DC/DC converter system .................................DC/DC1 : step-up
DC/DC2 : inverting(negative voltage)
Voltage Detector ..........................................................Nch. Open Drain Output
Low voltage operation available
RV5VH1
,RV5VH2
..........................................oscillator start-up from 0.8V
RV5VH3
.................................................................oscillator start-up from 1.8V
High Efficiency.............................................................TYP. 80%
Low Supply Current
High accuracy feedback sensing ...............................TYP. 2.5%
Sleep Mode
RV5VH1
, RV5VH2
..........................................DC/DC 2
RV5VH3
.................................................................DC/DC1, 2
Available to adjust temperature drift .........................DC/DC2 : with external resistor (RV5VH2
, RV5VH3
)
coefficient of output voltage
Small Package ..............................................................8pin SSOP(0.65mm pitch)
APPLICATIONS
Power source for telecommunication systems
Power source for portable data processing systems, e.g. PDA, Electronic Data Banks
Power source for Audio-Visual systems, e.g. CD players, Video cameras
Power source for Notebook PCs, Word processing systems
Gadgets which need two power supplies, e.g. CPU and LCD
2
BLOCK DIAGRAM
+
+
CSW
V
SEN
V
OUT1
L
X1
D
OUT
FB
EXT2
GND
Vref
Error Amp.1
Error Amp.2
1
2
3
4
8
7
6
5
VFM2
V
LX
lim.
VFM1
OSC
p_shift
+
DC/DC CONVERTER CONTROLLER
(BOOST / INVERTING)
RV5VH1
/ RV5VH2
RV5VH1
+
+
CSW
V
SEN
V
OUT1
EXT1
D
OUT
FB
EXT2
GND
Vref
Error Amp.1
Error Amp.2
1
2
3
4
8
7
6
5
VFM2
VFM1
OSC
p_shift
+
RV5VH2
3
RV5VH1
/RV5VH2
PIN CONFIGURATION
1
2
3
4
8
7
6
5
8 pin SSOP (0.65mm pitch)
PIN DESCRIPTION
RV5VH1
Pin No.
Symbol
Description
1
CSW
Control switch for DC/DC2
2
V
SEN
Sensing Pin for Voltage Detector
3
V
OUT1
Output for DC/DC1, Power supply for the device
4
L
X1
Output for DC/DC1, switching (Nch Open-Drain)
5
GND
Ground
6
EXT2
External Transistor drive pin for DC/DC2 (CMOS output)
7
FB
Input for DC/DC2 Error Amplifier
8
D
OUT
Output for Voltage detector
RV5VH2
Pin No.
Symbol
Description
1
CSW
Contol switch for DC/DC2
2
V
SEN
Sensing Pin for Voltage Detector
3
V
OUT1
Output for DC/DC1, Power supply for the device
4
EXT1
External Transistor drive pin for DC/DC1 (CMOS output)
5
GND
Ground
6
EXT2
External Transistor drive pin for DC/DC2 (CMOS output)
7
FB
Input for DC/DC2 Error Amplifier
8
D
OUT
Output for Voltage Detector
RV5VH1
/RV5VH2
4
ABSOLUTE MAXIMUM RATINGS
RV5VH1
Symbol
Item
Ratings
Unit
V
OUT1
V
OUT1
Pin Voltage
12
V
V
LX1
L
X1
Pin Voltage
12
V
V
SEN
V
SEN
Pin Voltage
12
V
D
OUT
D
OUT
Pin Voltage
12
V
V
CSW
CSW Pin Voltage
0.3 to V
OUT1
+0.3
V
V
EXT2
EXT2 Pin Voltage
0.3 to V
OUT1
+0.3
V
V
FB
FB Pin Voltage
0.3 to V
OUT1
+0.3
V
I
LX1
L
X1
Output Current
400
mA
I
EXT2
EXT2 Output Current
50
mA
P
D
Power Dissipation
300
mW
Topt
Operating Temperature
40 to +85
C
Tstg
Storage Temperature
55 to +125
C
Tsolder
Lead Temperature (Soldering)
260C
10sec
5
RV5VH1
/RV5VH2
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings are threshold limit values that must not be exceeded even for an instant under
any conditions. Moreover, such values for any two items must not be reached simultaneously. Operation
above these absolute maximum ratings may cause degradation or permanent damage to the device. These
are stress ratings only and do not necessarily imply functional operation below these limits.
RV5VH2
Symbol
Item
Ratings
Unit
V
OUT1
V
OUT1
Pin Voltage
12
V
V
SEN
V
SEN
Pin Voltage
12
V
D
OUT
D
OUT
Pin Voltage
12
V
V
CSW
CSW Pin Voltage
0.3 to V
OUT1
+0.3
V
V
EXT1, 2
EXT1, 2 Pin Voltage
0.3 to V
OUT1
+0.3
V
V
FB
FB Pin Voltage
0.3 to V
OUT1
+0.3
V
I
EXT1, 2
EXT1, 2 Output Current
50
mA
P
D
Power Dissipation
300
mW
Topt
Operating Temperature
40 to +85
C
Tstg
Storage Temperature
55 to +125
C
Tsolder
Lead Temperature (Soldering)
260C
10sec
RV5VH1
/RV5VH2
6
ELECTRICAL CHARACTERISTICS
RV5VH101
DC/DC Converter 1
*
) V
IN
=1.2V, I
OUT
=10mA, Topt=25C, unless otherwise specified. (See Typical Application)
*
1 ) This value only shows the supply current of DC/DC1, not include the supply current of Voltage Detector and external resistors.
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
OUT1
Step-up Output Voltage
2.925
3.000
3.075
V
V
IN
max
Maximum Input Voltage
10
V
Vstart
Oscillator Start-up Voltage
No Load
0.7
0.8
V
Vhold
Hold-on Input Voltage
I
OUT
=1mA, V
IN
: 2
0V
0.7
V
I
SS1
Supply Current1 *
1
No Load, CSW="L"
10
A
I
LX
L
X
Switching Current
V
LX
=0.4V
100
mA
I
LXleak
L
X
Leakage Current
V
LX
=6.0V, V
IN
=3.5V
0.03
1
A
fosc
Maximum Oscillator Frequency
110
130
150
kHz
Maxdty
Oscillator Duty Cycle
ON (V
LX
="L")
50
65
80
%
Efficiency
80
%
V
LXlim
Voltage Limit for L
X
Switch
for L
X
pin
0.4
0.8
V
V
OUT1
Output Voltage Temp. Coefficient
40C
Topt
85C
100
ppm/C
Topt
V
OUT1
=3.0V, Topt=25C
7
RV5VH1
/RV5VH2
DC/DC Converter 2
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
SET
Set Output Voltage
*
1
0
V
V
FB
Feed Back Voltage
20
0
20
mV
V
IN
Maximum Input Voltage
10
V
V
OPT
min
Minimum Operating Voltage
I
OUT
=1mA
1.8
V
I
SS2
Supply Current2
CSW= "H" at No Load
10
A
Istandby
Standby Current
CSW="L"
0.3
A
I
EXT2H
EXT2 "H" Output Current
V
EXT2
=V
OUT1
0.4V
2
4
mA
I
EXT2L
EXT2 "L" Output Current
V
EXT2
=0.4V
4
8
mA
fosc
Maximum Oscillator Frequency
110
130
150
kHz
Maxdty
Oscillator Duty Cycle
V
EXT2
="H"
40
50
60
%
V
CSWH
CSW "H" Input Voltage
V
OUT1
=3.0V
1.6
V
OUT1
V
V
CSWL
CSW "L" Input Voltage
V
OUT1
=3.0V
0
0.4
V
I
CSWleak
CSW Input Leakage Current
V
OUT1
=3.0V
0.5
0.5
A
V
FB
Feed Back Voltage Temp. Coefficient
40C
Topt
85C
30
V/C
Topt
*
) V
OUT1
=3.0V, I
OUT
=1mA, Topt=25C, unless otherwise specified. (See Typical Application)
*
1 ) Adjustable by external resistors to -30V.
V
OUT1
=3.0V, Topt=25C
RV5VH1
/RV5VH2
8
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
DET
Detector Threshold
2.633
2.700
2.767
V
V
HYS
Detector Threshold Hysteresis
0.081
0.135
0.189
V
I
SS3
Supply Current3
1.2
A
V
IN
max
Maximum Input Voltage
10
V
V
OPT
min
Minimum Operating Voltage
1.8
V
I
OUT
Output Current
V
DS
=0.5V, V
OUT1
=1.5V
1.0
2.0
mA
V
DS
=0.5V, V
OUT1
=3.0V
4.0
5.0
mA
I
SEN
Sensing pin Input Current
V
SEN
=3.0V
0.3
1.2
A
V
SEN
Sensing pin Input Voltage
0.7
10
V
t
PLH
Output Delay
100
s
V
OUT1
Detector Threshold Temp.Coefficient
40C
Topt
85C
100
ppm/C
Topt
I
DOUTleak
D
OUT
Leakage Current
0.03
0.5
A
V
OUT1
=3.0V, Topt=25C
Voltage Detector
*
) V
OUT1
=3.0V, Topt=25C, unless otherwise specified. (See Typical Application)
9
RV5VH1
/RV5VH2
RV5VH102
DC/DC Converter 1
*
) V
IN
=1.2V, I
OUT
=10mA, Topt=25C, unless otherwise specified. (See Typical Application)
*
1 ) This value only shows the supply current of DC/DC1, not include the supply current of Voltage Detector and external resistors.
V
OUT1
=5.0V, Topt=25C
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
OUT1
Step-up Output Voltage
4.875
5.000
5.125
V
V
IN
max
Maximum Input Voltage
10
V
Vstart
Oscillator Start-up Voltage
No Load
0.7
0.8
V
Vhold
Hold-on Input Voltage
I
OUT
=1mA, V
IN
: 2
0V
1.2
V
I
SS1
Supply Current1 *
1
No Load, CSW="L"
15
A
I
LX
L
X
Switching Current
V
LX
=0.4V
100
mA
I
LXleak
L
X
Leakage Current
V
LX
=6.0V, V
IN
=5.5V
0.03
1
A
fosc
Maximum Oscillator Frequency
110
130
150
kHz
Maxdty
Oscillator Duty Cycle
ON (V
LX
="L")
55
70
85
%
Efficiency
80
%
V
LXlim
Voltage Limit for L
X
Switch
0.4
0.8
V
V
OUT1
Output Voltage Temp. Coefficient
40C
Topt
85C
100
ppm/C
Topt
RV5VH1
/RV5VH2
10
DC/DC Converter 2
V
OUT1
=5.0V, Topt=25C
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
SET
Set Output Voltage
*
1
3.000
0
V
V
FB
Feed Back Voltage
0
mV
V
IN
Maximum Input Voltage
10
V
V
OPT
min
Minimum Operating Voltage
I
OUT
=1mA
1.8
V
I
SS2
Supply Current2
CSW= "H" at No Load
25
A
Istandby
Standby Current
CSW="L"
0.3
A
I
EXT2H
EXT2 "H" Output Current
V
EXT2
=V
OUT1
0.4V
3
6
mA
I
EXT2L
EXT2 "L" Output Current
V
EXT2
=0.4V
7
14
mA
fosc
Maximum Oscillator Frequency
110
130
150
kHz
Maxdty
Oscillator Duty Cycle
V
EXT2
="H"
40
50
60
%
V
CSWH
CSW "H" Input Voltage
V
OUT1
=5.0V
1.6
V
OUT1
V
V
CSWL
CSW "L" Input Voltage
V
OUT1
=5.0V
0
0.4
V
I
CSWleak
CSW Input Leakage Current
V
OUT1
=5.0V
0.5
0.5
A
V
FB
Feed Back Voltage Temp. Coefficient
40C
Topt
85C
30
V/C
Topt
*
) V
OUT1
=3.0V, I
OUT
=1mA, Topt=25C, unless otherwise specified. (See Typical Application)
*
1 ) Adjustable by external resistors to -30V.
11
RV5VH1
/RV5VH2
Voltage Detector
V
OUT1
=5.0V, Topt=25C
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
DET
Detector Threshold
4.388
4.500
4.612
V
V
HYS
Detector Threshold Hysteresis
0.135
0.225
0.315
V
I
SS3
Supply Current3*
1
1.8
A
V
IN
max
Maximum Input Voltage
10
V
V
OPT
min
Minimum Operating Voltage*
2
1.8
V
I
OUT
Output Current
V
DS
=0.5V, V
OUT1
=1.5V
1.0
2.0
mA
V
DS
=0.5V, V
OUT1
=5.0V
7.0
10.0
mA
I
SEN
Sensing Pin Input Current
V
SEN
=5.0V
0.7
2.0
A
t
PLH
Output Delay
100
s
V
OUT1
Detector Threshold Temp.Coefficient
40C
Topt
85C
100
ppm/C
Topt
I
DOUTleak
D
OUT
Leakage Current
0.03
0.5
A
*
) V
OUT1
=3.0V, Topt=25C, unless otherwise specified. (See Typical Application)
RV5VH1
/RV5VH2
12
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
OUT1
Step-up Output Voltage
I
OUT
=0mA
2.925
3.000
3.075
V
V
IN
max
Maximum Input Voltage
10
V
Vstart
Oscillator Start-up Voltage
No Load
0.7
0.8
V
Vhold
Hold-on Input Voltage
I
OUT
=1mA
0.7
V
I
SS1
Supply Current1 *
1
I
OUT
=0mA, CSW="L"
80
A
I
EXT1H
EXT1 "H" Output Current
V
EXT2
=V
OUT1
0.4V
1.5
3
mA
I
EXT1L
EXT1 "L" Output Current
V
EXT2
=0.4V
4
8
mA
fosc
Maximum Oscillator Frequency
110
130
150
kHz
Maxdty
Oscillator Duty Cycle
ON (V
LX
="L")
50
65
80
%
V
OUT1
Output Voltage Temp. Coefficient
40C
Topt
85C
100
ppm/C
Topt
RV5VH201
DC/DC Converter 1
V
OUT1
=3.0V, Topt=25C
*
) V
IN
=1.2V, I
OUT
=10mA, unless otherwise specified. (See Typical Application)
*
1 ) This value shows only the supply current of DC/DC1, not include the supply current of Voltage Detector and external resistors.
13
RV5VH1
/RV5VH2
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
SET
Output Voltage Setting Range
*
1
0
V
V
FB
Feed Back Voltage
20
0
20
mV
V
IN
Maximum Input Voltage
10
V
V
OPT
min
Minimum Operating Voltage*
2
I
OUT
=1mA
1.8
V
I
SS2
Supply Current2*
3
CSW= "H" I
OUT
=0mA
10
A
Istandby
Standby Current
CSW="L"
0.3
A
I
EXT2H
EXT2 "H" Output Current
V
EXT2
=V
OUT1
0.4V
2
4
mA
I
EXT2L
EXT2 "L" Output Current
V
EXT2
=0.4V
4
8
mA
fosc
Maximum Oscillator Frequency
110
130
150
kHz
Maxdty
Oscillator Duty Cycle
V
EXT2
="H"
40
50
60
%
V
CSWH
CSW "H" Input Voltage
V
OUT1
=3.0V
1.6
V
OUT1
V
V
CSWL
CSW "L" Input Voltage
V
OUT1
=3.0V
0
0.4
V
I
CSWleak
CSW Input Leakage Current
CSW=3.0V
0.5
0.5
A
V
FB
Feed Back Voltage Temp. Coefficient
40C
Topt
85C
30
V/C
Topt
DC/DC Converter 2
*
) V
OUT1
=3.0V, V
OUT2
=-0.3V, I
OUT2
=1mA, unless otherwise specified. (See Typical Application)
*
1 ) Adjustable by external resistors to -30V.
*
2 ) "Minimum Operating Voltage"means a voltage for the "V
OUT1
" pin.
*
3 ) This value shows only the supply current of DC/DC2, not include the supply current of external resistors.
V
OUT1
=3.0V, Topt=25C
RV5VH1
/RV5VH2
14
Voltage Detector
V
OUT1
=3.0V, Topt=25C
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
DET
Detector Threshold
2.633
2.700
2.767
V
V
HYS
Detector Threshold Hysteresis
0.081
0.135
0.189
V
I
SS3
Supply Current3*
1
1.2
A
V
IN
max
Maximum Input Voltage
10
V
V
OPT
min
Minimum Operating Voltage*
2
1.8
V
I
OUT
Output Current
V
DS
=0.5V, V
OUT1
=1.5V
1.0
2.0
mA
V
DS
=0.5V, V
OUT1
=3.0V
4.0
5.0
mA
I
SEN
Sensing Pin Input Current
V
SEN
=3.0V
0.3
1.2
A
t
PLH
Output Delay
100
s
V
OUT1
Detector Threshold Temp.Coefficient
40C
Topt
85C
100
ppm/C
Topt
I
DOUTleak
D
OUT
Leakage Current
0.03
0.5
A
*
) V
OUT1
=3.0V : unless otherwise specified. (See Typical Application)
*
1 ) This value only shows the supply current of voltage detector.
*
2 ) "Minimum Operating Voltage"means a voltage for the "V
OUT1
" pin.
15
RV5VH1
/RV5VH2
RV5VH202
DC/DC Converter 1
V
OUT1
=5.0V, Topt=25C
*
) V
IN
=3.0V, I
OUT
=10mA : unless otherwise specified. (See Typical Application)
*
1 ) This value only shows the supply current of DC/DC1, does not include the supply current of Voltage Detector and external resistors.
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
OUT1
Step-up Output Voltage
I
OUT
=0mA
4.875
5.000
5.125
V
V
IN
max
Maximum Input Voltage
10
V
Vstart
Oscillator Start-up Voltage
No Load
0.7
0.8
V
Vhold
Hold-on Input Voltage
I
OUT
=1mA
0.7
V
I
SS1
Supply Current1 *
1
I
OUT
=0mA, CSW="L"
40
A
I
EXT1H
EXT1 "H" Output Current
V
EXT2
=V
OUT1
0.4V
2
4
mA
I
EXT1L
EXT1 "L" Output Current
V
EXT2
=0.4V
7
14
mA
fosc
Maximum Oscillator Frequency
110
130
150
kHz
Maxdty
Oscillator Duty Cycle
ON (V
LX
="L")
55
70
85
%
Efficiency
80
%
V
OUT1
Output Voltage Temp. Coefficient
40C
Topt
85C
100
ppm/C
Topt
RV5VH1
/RV5VH2
16
DC/DC Converter 2
*
) V
OUT1
=5.0V, V
OUT2
=3.0V, I
OUT2
=1mA : unless otherwise specified. (See Typical Application)
*
1 ) Adjustable by external resistors to -30V.
*
2 ) "Minimum Operating Voltage"means a voltage for the "V
OUT1
" pin.
*
3 ) This value shows only the supply current of DC/DC2, not include the supply current of external resistors.
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
SET
Output Voltage Setting Range
*
1
0
V
V
FB
Feed Back Voltage
0
mV
V
IN
Maximum Input Voltage
10
V
V
OPT
min
Minimum Operating Voltage*
2
I
OUT
=1mA
1.8
V
I
SS2
Supply Current2*
3
CSW= "H", No Load
25
A
Istandby
Standby Current
CSW="L"
0.3
A
I
EXT2H
EXT2 "H" Output Current
V
EXT2
=V
OUT1
0.4V
3
6
mA
I
EXT2L
EXT2 "L" Output Current
V
EXT2
=0.4V
7
14
mA
fosc
Maximum Oscillator Frequency
110
130
150
kHz
Maxdty
Oscillator Duty Cycle
V
EXT2
="H"
40
50
60
%
V
CSWH
CSW "H" Input Voltage
V
OUT1
=5.0V
1.6
V
OUT1
V
V
CSWL
CSW "L" Input Voltage
V
OUT1
=5.0V
0
0.4
V
I
CSWleak
CSW Input Leakage Current
CSW=5.0V
0.5
0.5
A
V
FB
Feed Back Voltage Temp.Coefficient
40C
Topt
85C
30
V/C
Topt
V
OUT1
=5.0V, Topt=25C
17
RV5VH1
/RV5VH2
Voltage Detector
V
OUT1
=5.0V, Topt=25C
*
) V
OUT1
=5.0V : unless otherwise specified. (See Typical Application)
*
1 ) This value only shows the supply current of voltage detector.
*
2 ) "Minimum Operating Voltage"means a voltage for the "V
OUT1
" pin.
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
DET
Detector Threshold
4.388
4.500
4.612
V
V
HYS
Detector Threshold Hysteresis
0.135
0.225
0.315
V
I
SS3
Supply Current3*
1
1.8
A
V
IN
max
Maximum Input Voltage
10
V
V
OPT
min
Minimum Operating Voltage*
2
1.8
V
I
OUT
Output Current
V
DS
=0.5V, V
OUT1
=1.5V
1.0
2.0
mA
V
DS
=0.5V, V
OUT1
=5.0V
7.0
10.0
mA
I
SEN
Sensing Pin Input Current
V
SEN
=5.0V
0.7
2.0
A
t
PLH
Output Delay
100
s
V
OUT1
Detector Threshold Temp.Coefficient
40C
Topt
85C
100
ppm/C
Topt
I
DOUTleak
D
OUT
Leakage Current
0.03
0.5
A
RV5VH1
/RV5VH2
18
OPERATION
DC/DC Converter 1
The DC/DC1 uses input voltage as an initial power supply, once boost operation is started, the boost output will be used
for the power supply of device itself. A change in the V
OUT1
will feed back to the internal error amplifier through external
voltage setting resistors and internal feed back resistors. When the feed back voltage is lower than the reference voltage
the error amplifier enables oscllation or otherwise will stop oscillation. The internal feed back resistor "R" which is fixed
and adjusted by laser trim can make the feed back input voltage to "Error Amp.1" stable. Pulses from the "OSC" circuit
have a duty cycle of 50% and it becomes 65 to 75%(at high side) through the "P_shift" circuit. The duty cycle may be
smaller with light load spontaneously.
These clook pulses control VFM circuit and make it possible to operate as a boost converter. The output of L
X1
is Nch open
drain, while the output of "EXT1" is driven by CMOS buffer and an external NMOS driver is also available instead of an
NPN transistor, in such cases the Rb and the Cb are not necessary. A recommended Rb is 300
.
When you use a MOS-
FET for the EXT1, the input voltage should be high enough and you can get high effiiciency applications.
A current limit is available only for the RV5VH1 series, to prevent an excess current from flowing through Nch driver tran-
sistor.
The DC/DC1 can be shut down by CSW pin. When the CSW pin is High, V
DD
level, the DC/DC1 is enabled and when the
CSW pin is "L", GND level, the DC/DC1 is disabled. The EXT1 pin outputs "L" while the DC/DC1 is disabled.
C
L
SBD
V
OUT1
V
OUT1
L
X1
R
+
V
LX
lim.
OSC
Vref
p_shift
VFM1
V
IN
RV5VH1
Error Amp.1
3
4
C
L1
SBD
V
OUT1
V
OUT1
EXT1
R
+
OSC
Vref
p_shift
V
IN
RV5VH2
Error Amp.1
VFM1
NPN Tr.
Cb
3
4
Rb
19
RV5VH1
/RV5VH2
C1
L
FB
V
OUT2
V
OUT1
EXT2
+
RV5VH1
/RV5VH2
Error Amp.2
VFM2
CSW
6
1
7
SBD
+
PMOS
OSC
C2
R2
R1
The DC/DC2 can operate by a voltage of "V
OUT1
". A change in the V
OUT2
will feed back to the internal error amplifier
through external voltage setting resistors. The reference voltage should be provided from externally fixed power supply
such as V
OUT1
.
When the feed back voltage to the cmp2 is higher than the ground voltage the error amplifier enables oscillation or other-
wise will stop oscillation.
Pulses from the "OSC" circuit have a duty cycle of 50% and it makes VFM operation allowable. There might be certain
cases that the duty cycles becomes smaller temporarily at light load current. The output of "EXT2" is driven by CMOS
buffer operated V
OUT1
and GND.
A PMOS driver will be connected to the "EXT2" pin and its switching operation generates negative output voltage through
energy accumulated in an inductor.
The DC/DC1 can be shut down by CSW pin. When the CSW pin is "H", V
DD
level, the DC/DC1 is enabled and when the
CSW pin is "L", GND level, the DC/DC1 is disabled. The EXT2 pin outputs High while the DC/DC2 is disabled.
Set output voltage DC/DC Converter2
V
OUT2
is described as follows:
V
OUT1
:R1=|V
OUT2
| : R2
/ The FB voltage is controlled to 0V and V
OUT1
is provided externally
|V
OUT2
|=V
OUT1
R2/R1
thus, any output voltage of DC/DC2 can be set by changing R1 or/and R2.
Certain temperature coefficient of V
OUT2
can be set by using R1,R2 having such temperature characteristics.
DC/DC Converter 2
RV5VH1
/RV5VH2
20
V
SEN
D
OUT
RV5VH1
/RV5VH2
Pull-up
Output Tr.
+
Vref
Ra
Rb
Rc
Tr.1
2
8
The VD can operate by the voltage of "V
OUT1
". The detector threshold and the reset voltage are internally adjusted by
trimmed resistors and the VD monitors V
SEN
pin voltage.
The D
OUT
is Nch open-drain output and a pull up resistor is necessary.
Oepration Diagram
V
SEN
pin is pulled up to V
OUT1
voltage
Voltage Detector
A
B
Reset Voltage
Detector Threshold
GND
GND
Output Voltage
1 2 3 4 5
Hysteresis Range
+V
DET
V
DET
Step
Step 1
Step 2
Step 3
Step 4
Step 5
Comparator(+) Pin
Input Voltage
A
B
B
B
A
Comparator Output
H
L
L
L
H
Tr. 1
OFF
ON
ON
ON
OFF
Output Tr
OFF
ON
Indefinite
ON
OFF
A :
Rb+Rc
V
SEN
Ra+Rb+Rc
B :
Rb
V
SEN
Ra+Rb+Rc
Step 1. Output Voltage is equal to Pull-up Voltage.
Step 2. When Input voltage (V
SEN
) reaches the state of Vref
V
SEN
(Rb
Rc)/(Ra+Rb+Rc) at point A, the output of the comparator is reversed. so that the
output voltage becomes to GND.
Step 3. Output VoItage becomes indefinite when Power source Voltage (V
SEN
) is smaller than Minimum Operating VoItage. When the output is pulIed up,
Output becomes pull-up voltage and GND.
Step 4. Output VoItage becomes to GND.
Step 5. When input voltage(V
SEN
) reaches the state of Vref
V
SEN
Rb/(Ra+Rb) at point B, the output of the comparator is reversed, so that the output voltage
becomes to pull-up voltage.
21
RV5VH1
/RV5VH2
OPERATION OF STEP-UP DC/DC CONVERTER
Step-up DC/DC Converter charges energy in the inductor when Lx Transistor (LxTr) is on, and discharges the
energy with the addition of the energy from Input Power Source thereto, so that a higher output voltage than the
input voltage is obtained.
The operation will be explained with reference to the following diagrams :
< Current through L >
< Basic Circuits >
i2
L
SD
I
OUT
V
OUT
CL
Lx Tr
i1
V
IN
IL
ILmin
ILmax
topen
t
ton
toff
T=1/fosc
Step 1 : LxTr is turned ON and current IL (=i1 ) flows, so that energy is charged in L. At this moment, IL(=i1 )
is increased from ILmin (=0) to reach ILmax in protection to the on-time period (ton) of LxTr.
Step 2 : When LxTr is turned OFF, Schottky diode (SD) is turned on in order that L maintains IL at ILmax, so that
current IL (=i2) is released.
Step 3 : IL (=i2) is gradually decreased, and IL reaches ILmin (=0) after a time period of topen, so that SD is
turned OFF.
In the case of VFM control system, the output voltage is maintained constant by controlling the oscillator fre-
quency (fosc) with the on-time period (ton) being maintained constant.
In the above two diagrams, the maximum value (ILmax) and the minimum value (ILmin) of the current which
flows through the inductor are the same as those when LxTr is ON and also when LxTr is OFF.
The difference between ILmax and ILmin, which is represented by
I, is:
I=ILmaxILmin=V
IN
ton/L=(V
OUT
V
IN
) topen/L ..........................................Equation 1
wherein T=1/fosc=ton+toff
duty (%)=ton/T 100=ton fosc 100
topen
toff
In Equation 1,V
IN
ton/L and (V
OUT
V
IN
) topen/L are respectively the change in the current at ON, and the
change in the current at OFF.
In the VFM system, topen < toff as illustrated in the above diagram. In this case, the energy charged in the
inductor during the time period of ton is discharged in its entirely during the time period of toff, so that ILmin
becomes zero (ILmin=0).
RV5VH1
/RV5VH2
22
The above explanation is directed to the calculation in an ideal case where it is supposed that there is no
energy loss in the external components and LxSW. In an actual case, the maximum output current will be 50
to 80% of the above calculated maximum output current. In particular, care must be taken because V
IN
is
decreased in an amount corresponding to the voltage reduction caused by LxSW when IL is large or V
IN
is
small. Furthermore, It is required that with respect to V
OUT
, Vf of the diode (about 0.3V in the case of a
Schottky type diode) be taken into consideration.
When I
LX
and V
LX
exceed their respective ratings, use the RV5VH with the attachment of an external tran-
sistor with a low saturation voltage thereto.
HINTS
When LxTr is on, the energy P
ON
charged in the inductor is provided by Equation 2 as follows :
P
ON
=
0
ton
(V
IN
IL (t)) dt=
0
ton
(V
IN
2
t/L) dt
=V
IN
2
ton
2
/(2 L)....................................................................................................Equation 2
In the case of the step-up DC/DC converter, the energy is also supplied from the input power source at the time
of OFF.
Thus, P
OFF
=
0
topen
(V
IN
IL (t)) dt=
0
topen
(V
IN
(V
OUT
V
IN
) t/L)dt
=V
IN
(V
OUT
V
IN
) topen
2
/(2 L)
Here, topen=V
IN
ton/(V
OUT
V
IN
) from Equation 1, and when this is substituted into the above equation.
=V
IN
3
ton
2
/(2 L (V
OUT
V
IN
)) ............................................................................Equation 3
Input power P
IN
is (P
ON
+P
OFF
)/T. When this is converted in its entirely to the output.
P
IN
=(P
ON
+P
OFF
)/T=V
OUT
I
OUT
=P
OUT
.........................................................................Equation 4
Equation 5 can be obtained as follows by solving Equation 4 for I
OUT
by substituting Equation 2 and 3 into
Equation 4 :
I
OUT
=V
IN
2
ton
2
/(2 L T (V
OUT
V
IN
)
=V
IN
2
maxdty
2
/(20000 fosc L (V
OUT
V
IN
)) ...................................................Equation 5
The peak current which flows through L LxTr SD is
ILmax=V
IN
ton/L..........................................................................................................Equation 6
Therefore, it is necessary that the setting of the input/output conditions and the selection of peripheral compo-
nents be made with ILmax taken into consideration.
SELECTION OF PERIPHERAL COMPONENTS
23
RV5VH1
/RV5VH2
<Components>
Coils
L1 : 27H, L2 : 220H
Diodes
Schottky type
Capacitors
C1 : 47F(tantalum type), C2 : 22F(tantalum type)
C3 : 0.01F(ceramic type)
C4 : 0.01F(ceramic type)
PMOS
2SJ238(TOSHIBA), etc.
NPN Tr.
2SD1628G(SANYO), etc.
Resistors
R1 : 100K
R2 : 0-500K
R3 : 100K
R4 : 300
TYPICAL APPLICATION
RV5VH1
CSW
V
SEN
V
OUT1
L
X1
D
OUT
FB
EXT2
GND
C2
L1
L2
D1
PMOS
R3
R1
R2
C3
D2
C1
Output DC/DC1
Output DC/DC2
RV5VH2
CSW
V
SEN
V
OUT1
EXT1
D
OUT
FB
EXT2
GND
C2
L1
L2
SBD
PMOS
R3
R1
R2
C3
SBD
C1
NPN Tr.
C4
R4
Output DC/DC1
Output DC/DC2
<Components>
CoiIs
L1 : 100H, L2 : 220H
Diodes
Schottky type
Capacitors
C1, C2 : 22F(tantalum type), C3 : 0.01F(ceramic type)
Tr
PMOS : 2SJ238
Resistors
R1, R2 : several hundreds k
, R3 : 100k
RV5VH1
/RV5VH2
24
TEST CIRCUITS
CSW
D
OUT
FB
EXT2
L1=100
H,220
H
GND
V
SEN
V
OUT1
L
X1
L1
V
22
F
A
Fig.1 Test Circuit 1
CSW
D
OUT
FB
EXT2
GND
V
SEN
V
OUT1
L
X1
(EXT1)
100k
150
A
V
V
5
(150
)
Oscilloscope
*
EXT1
*
Fig.2 Test Circuit 2
CSW
D
OUT
FB
EXT2
GND
V
SEN
V
OUT1
L
X1
A
0.5V
Fig.3 Test Circuit 3
25
RV5VH1
/RV5VH2
Test Circuit 1:
Typical Characteristics 1), 3), 5), 10), 11)
Test Circuit 2:
Typical Characteristics 6), 7), 8), 9), 13), 14), 15), 16), 17), 18), 19), 21)
Test Circuit 3:
Typical Characteristics 20)
Test Circuit 4:
Typical Characteristics 22)
Test Circuit 5:
Typical Characteristics 2), 4)
Typical Application : Typical Characteristics 12)
CSW
D
OUT
FB
EXT2
GND
V
SEN
V
OUT1
L
X1
100k
Pulse Input
Oscilloscope
Fig.4 Test Circuit 4
CSW
D
OUT
FB
EXT2
GND
V
SEN
V
OUT1
EXT1
V
96
F
27
H
2200pF
300
A
Fig.5 Test Circuit 5
RV5VH1
/RV5VH2
26
TYPICAL CHARACTERISTICS
DC/DC Converter 1
1) Output Voltage vs. Output Current (RV5VH1
)
RV5VH101
3.6
3.4
3.2
2.8
3.0
2.4
2.6
2.2
2.0
Output Current I
OUT
(mA)
Output Voltage V
OUT1
(V)
0
20
40
60
80
100
140
120
V
IN
=0.9V
V
IN
=1.2V
V
IN
=1.5V
V
IN
=2.0V
Topt=25C
L1=100
H
C1=22
F
RV5VH101
3.6
3.4
3.2
2.8
3.0
2.4
2.6
2.2
2.0
Output Current I
OUT
(mA)
Output Voltage V
OUT1
(V)
0
20
40
60
80
100
140
120
Topt=25C
L1=220
H
C1=22
F
V
IN
=0.9V
V
IN
=1.2V
V
IN
=1.5V
V
IN
=2.0V
RV5VH201
3.6
3.4
2.8
3.0
3.2
2.6
2.2
2.4
2.0
Output Current I
OUT
(mA)
Output Voltage V
OUT
(V)
0
100
200
300
400
500
Topt=25C
L1=27
H
C1=96
F
V
IN
=1.2V
V
IN
=0.9V
V
IN
=2.0V
V
IN
=1.5V
RV5VH202
6.0
5.5
4.5
5.0
4.0
3.5
3.0
Output Current I
OUT
(mA)
Output Voltage V
OUT
(V)
0
100
200
300
400
500
Topt=25C
L1=27
H
C1=96
F
V
IN
=0.9V
V
IN
=1.5V
V
IN
=4.0V
V
IN
=2.0V V
IN
=3.0V
RV5VH102
6.0
5.5
4.5
5.0
4.0
3.5
3.0
Output Current I
OUT
(mA)
Output Voltage V
OUT1
(V)
0
50
100
150
200
250
300
Topt=25C
L1=100
H
C1=22
F
V
IN
=0.9V
V
IN
=1.5V
V
IN
=2.0V
V
IN
=4.0V
V
IN
=3.0V
RV5VH102
6.0
5.5
4.5
5.0
4.0
3.5
3.0
Output Current I
OUT
(mA)
Output Voltage V
OUT1
(V)
0
50
100
150
200
250
300
Topt=25C
L1=220
H
C1=22
F
V
IN
=0.9V
V
IN
=1.5V
V
IN
=2.0V
V
IN
=4.0V
V
IN
=3.0V
2) Output Voltage vs. Output Current (RV5VH2
)
27
RV5VH1
/RV5VH2
3) Efficiency vs. Output Current (RV5VH1
)
RV5VH101
100
75
80
85
90
95
65
70
55
60
50
Output Current I
OUT
(mA)
Efficiency
(%)
0.01
0.1
1
10
100
Topt=25C
L1=100
H
C1=22
F
V
IN
=0.9V
V
IN
=1.2V
V
IN
=2.0V
V
IN
=1.5V
RV5VH101
100
75
80
85
90
95
65
70
55
60
50
Output Current I
OUT
(mA)
Efficiency
(%)
0.01
0.1
1
10
100
Topt=25C
L1=220
H
C1=22
F
V
IN
=1.2V
V
IN
=2.0V
V
IN
=1.5V
V
IN
=0.9V
RV5VH102
100
75
80
85
90
95
65
70
55
60
50
Output Current I
OUT
(mA)
Efficiency
(%)
0.1
1
10
100
1000
Topt=25C
L1=100
H
C1=22
F
V
IN
=1.5V
V
IN
=0.9V
V
IN
=2.0V
V
IN
=3.0V
V
IN
=4.0V
RV5VH102
100
75
80
85
90
95
65
70
55
60
50
Output Current I
OUT
(mA)
Efficiency
(%)
0.1
1
10
100
1000
Topt=25C
L1=220
H
C1=22
F
V
IN
=1.5V
V
IN
=0.9V
V
IN
=2.0V
V
IN
=3.0V
V
IN
=4.0V
RV5VH201
90
65
70
75
80
85
55
60
45
50
40
Output Current I
OUT
(mA)
Efficiency
(%)
0.01
0.1
1
10
100
1000
Topt=25C
L1=27
H
C1=96
F
V
IN
=1.5V
V
IN
=0.9V
V
IN
=1.2V
V
IN
=2.0V
RV5VH202
90
65
70
75
80
85
55
60
45
50
40
Output Current I
OUT
(mA)
Efficiency
(%)
0.1
1
10
100
1000
Topt=25C
L1=27
H
C1=96
F
V
IN
=1.5V
V
IN
=0.9V
V
IN
=2.0V
V
IN
=3.0V
V
IN
=4.0V
4) Efficiency vs. Output Current (RV5VH2
)
RV5VH1
/RV5VH2
28
5) DC/DC1 Output Voltage vs. Temperature
RV5VH1
/2
3.3
3.0
3.2
3.1
2.9
2.8
2.7
Temperature Topt(C)
Output Voltage V
OUT
(V)
60 40 20
0
20
40
60
80
100
V
IN
=1.2V
L1=100
H
C1=22
F
I
OUT
=10mA
I
OUT
=5mA
I
OUT
=0A
RV5VH1
/2
5.3
5.0
5.2
5.1
4.9
4.8
4.7
Temperature Topt(C)
Output Voltage V
OUT
(V)
60 40 20
0
20
40
60
80
100
V
IN
=3V
L1=100
H
C1=22
F
I
OUT
=10mA
I
OUT
=0A
I
OUT
=1mA
RV5VH1
/2
150
125
130
135
140
145
100
105
110
115
120
Temperature Topt(C)
Oscillator Frequency fosc(kH
Z
)
60 40 20
0
20
40
60
80
100
V
OUT1
=3V
RV5VH1
/2
150
125
130
135
140
145
100
105
110
115
120
Temperature Topt(C)
Oscillator Frequency fosc(kH
Z
)
60 40 20
0
20
40
60
80
100
V
OUT1
=5V
RV5VH1
/2
80
65
70
75
50
55
60
Temperature Topt(C)
Oscillator Duty Cycle Maxdty(%)
60 40 20
0
20
40
60
80
100
V
OUT1
=3V
RV5VH1
/2
80
65
70
75
50
55
60
Temperature Topt(C)
Oscillator Duty Cycle Maxdty(%)
60 40 20
0
20
40
60
80
100
V
OUT1
=5V
7) Oscillator Duty Cycle vs. Temperature
6) Oscillator Frequency vs. Temperature
29
RV5VH1
/RV5VH2
8) On Resistance of LX vs. Supply Voltage
RV5VH1
5.0
4.0
4.5
2.5
3.0
2.0
3.5
0.0
1.5
1.0
0.5
Supply Voltage V
OUT1
(V)
On Resistance Ron (
)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
85C
25C
40C
RV5VH201
18
12
10
8
16
14
0
6
4
2
Temperature Topt(C)
Output Current I
OUT
(mA)
60 40 20
0
20
40
60
80
100
V
OUT1
=3V
"L"
Output Current
"H"
Output Current
RV5VH202
18
12
10
8
16
14
0
6
4
2
Temperature Topt(C)
Output Current I
OUT
(mA)
60 40 20
0
20
40
60
80
100
V
OUT1
=5V
"L"
Output Current
"H"
Output Current
RV5VH1
/2
2
1
1.2
1.4
1.6
1.8
0
0.2
0.4
0.6
0.8
Output Current I
OUT
(mA)
Start-up/Hold-on Voltage Vstart/Vhold(V)
0
20
30
40
10
50
Topt=25C
V
OUT1
=3V
L1=100
H
C1=22
F
Vstart
Vhold
RV5VH101
10
0
10
6
10
5
10
4
10
3
10
2
10
1
Input Voltage V
IN
(V)
Input Current I
IN
(A)
0.0
1.0
1.5
2.0
2.5
0.5
3.0
Topt=25C
CSW=GND
L1=100
H
C1=22
F
I
OUT
=30mA
I
OUT
=5mA
I
OUT
=1mA
I
OUT
=0A
10) Start-up/Hold-on Voltage vs. Output Current
9) EXT1 Output Current vs. Temperature
11) Input Current vs. Intput Voltage
RV5VH1
/RV5VH2
30
12) Output Voltage vs. Output Current
RV5VH101
0
2
4
6
14
10
12
8
Output Current I
OUT
(mA)
Output Voltage V
OUT
(V)
0
4
8
6
10
12
2
14
Topt=25C
V
IN
=1.2V
V
OUT1
=3V
V
SET
6V
V
SET
9V
V
SET
12V
V
SET
3V
RV5VH1
/2
0.010
0.010
0.004
0.002
0.000
0.002
0.004
0.006
0.008
0.006
0.008
Temperature Topt(C)
Feed Back Voltage V
FB
(V)
60 40 20
0
20
40
60
80
100
RV5VH1
/2
20
0
6
8
10
12
14
16
18
4
2
Temperature Topt(C)
Output Current I
OUT
(mA)
60 40 20
0
20
40
60
80
100
V
OUT1
=3V
"L"
Output Current
"H"
Output Current
RV5VH1
/2
20
0
6
8
10
12
14
16
18
4
2
Temperature Topt(C)
Output Current I
OUT
(mA)
60 40 20
0
20
40
60
80
100
V
OUT1
=5V
"L"
Output Current
"H"
Output Current
14) EXT2 Output Current vs. Temperature
13) DC/DC2 Feed Back Voltage vs. Temperature
DC/DC Converter 2
31
RV5VH1
/RV5VH2
15) EXT2 Oscillator Frequency vs. Temperature
RV5VH1
/2
150
100
115
120
125
130
135
140
145
110
105
Temperature Topt(C)
Oscillator Frequency fosc(kH
Z
)
60 40 20
0
20
40
60
80
100
V
OUT1
=3V
RV5VH1
/2
150
100
115
120
125
130
135
140
145
110
105
Temperature Topt(C)
Oscillator Frequency fosc(kH
Z
)
60 40 20
0
20
40
60
80
100
V
OUT1
=5V
RV5VH1
/2
60
40
46
48
50
52
54
56
58
44
42
Temperature Topt(C)
Oscillator Duty Cycle Maxdty(%)
60 40 20
0
20
40
60
80
100
V
OUT1
=3V
RV5VH1
/2
60
40
46
48
50
52
54
56
58
44
42
Temperature Topt(C)
Oscillator Duty Cycle Maxdty(%)
60 40 20
0
20
40
60
80
100
V
OUT1
=5V
RV5VH1
/2
2.0
0.0
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0.4
0.2
Temperature Topt(C)
CSW ON/OFF Voltage (V)
60 40 20
0
20
40
60
80
100
V
OUT1
=3V
17) CSW ON/OFF Voltage vs. Temperature
16) EXT2 Oscillator Duty Cycle vs. Temperature
RV5VH1
/RV5VH2
32
18) Detector Threshold Voltage vs. Temperature
RV5VH1
/2
3.0
2.5
2.7
2.8
2.9
2.6
Temperature Topt(C)
Detector Threshold Voltage V
DET
(V)
60 40 20
0
20
40
60
80
100
+V
DET
V
DET
RV5VH1
/2
5.0
4.5
0.0
2.0
1.5
3.0
2.5
4.0
3.5
1.0
0.5
V
OUT1
Output Voltage V
OUT1
(V)
Output Current V
OUT
(V)
0
1
2
3
4
5
85C
25C
40C
RV5VH1
/2
20
18
0
8
6
12
10
16
14
4
2
V
OUT1
Output Voltage V
OUT1
(V)
D
OUT
Output Current I
DOUT
(mA)
0
1
2
3
4
5
6
7
85C
25C
40C
RV5VH1
/2
0.7
0.6
0.0
0.4
0.3
0.5
0.1
0.2
V
SEN
Output Voltage V
SEN
(V)
V
SEN
Output Current I
VSEN
(
A)
0
1
2
3
4
5
6
7
85C
25C
40C
RV5VH1
/2
10
0.01
1
0.1
Load Capacitance C
OUT
(
F)
Output Delay Time tp(ms)
0.0001
0.1
0.01
0.001
t
PLH
t
PHL
V
OUT1
=3V
22) Output Delay Time vs. Load Capacitance
20) D
OUT
Output Current vs. V
OUT1
Output Voltage
19) V
OUT1
Output Voltage vs. Output Current
21) V
SEN
Output Current vs. V
SEN
Output Voltage
Voltage Detector
33
BLOCK DIAGRAM
+
+
CSW
FB1
V
DD
EXT1
D
OUT
FB2
EXT2
GND
Vref
Error Amp.1
Error Amp.2
1
2
3
4
8
7
6
5
VFM2
VFM1
OSC
p_shift
+
DC/DC CONVERTER CONTROLLER
(BOOST / INVERTING OUTPUT FOR LCD)
RV5VH3
PIN CONFIGURATION
1
2
3
4
8
7
6
5
8 pin SSOP (0.65mm pitch)
RV5VH3
34
PIN DESCRIPTION
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings are threshold limit values that must not be exceeded even for an instant under
any conditions. Moreover, such values for any two items must not be reached simultaneously. Operation
above these absolute maximum ratings may cause degradation or permanent damage to the device. These
are stress ratings only and do not necessarily imply functional operation below these limits.
Pin No.
Symbol
Description
1
CSW
Control Switch for DC/DC1, 2
2
FB1
Input for DC/DC1 Error Amplifier
3
V
DD
Power Supply for Device Itself. Sensing Pin for Reset.
4
EXT1
External Transistor Drive Pin for DC/DC1 (CMOS Output)
5
GND
Ground Pin
6
EXT2
External Transistor Drive Pin for DC/DC2 (CMOS Output)
7
FB2
Input for DC/DC2 Error Amplifier
8
D
OUT
Output for Voltage Detector
Symbol
Item
Ratings
Unit
V
DD
V
DD
Pin Voltage
12
V
D
OUT
D
OUT
Pin Voltage
12
V
V
CSW
CSW Pin Voltage
0.3 to V
DD
+0.3
V
V
EXT1, 2
EXT1, 2 Pin Voltage
0.3 to V
DD
+0.3
V
V
FB
FB1,2 Pin Voltage
0.3 to V
DD
+0.3
V
I
EXT1, 2
EXT1, 2 Output Current
50
mA
P
D
Power Dissipation
300
m
Topt
Operating Temperature
40 to +85
C
Tstg
Storage Temperature
55 to +125
C
Tsolder
Lead Temperature (Soldering)
260C
10sec
ABSOLUTE MAXIMUM RATINGS
GND=0V
35
RV5VH3
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
SET1
Output Voltage Setting 1
2.05
*
1
V
V
FB1
Feed Back Volatage 1
1.950
2.000
2.050
V
V
IN
max
Maximum Input Voltage
10
V
V
OPT
min
Minimum Operating Voltage
Specified as a V
DD
1.8
V
Voltage for Device Operation
I
SS11
Supply Current11*
2
CSW="H", FB1=1.9V
15
60
A
I
SS12
Supply Current12*
2
CSW="H", FB1=2.1V
4
A
Istandby
Standby Current*
3
CSW="L"
4
11
A
I
EXT1H
EXT1 "H" Output Current
V
EXT1
=V
DD
0.4V
1.5
3
mA
I
EXT1L
EXT1 "L" Output Current
V
EXT1
=0.4V
4
8
mA
fosc
Maximum Oscillator Frequency
110
130
150
kHz
Maxdty
Oscillator Duty Cycle
ON (V
EXT1
="L")
50
65
80
%
V
FB1
Feed Back Voltage Temp.Coefficient
40C
Topt
85C
100
ppm/C
Topt
V
CSWH
CSW "H" Input Voltage
1.6
V
DD
V
V
CSWL
CSW "L" Input Voltage
0
0.4
V
I
CSW
leak
CSW Input Leakage Current
CSW=3.0V or CSW=0V
0.5
0.5
A
*
) V
DD
=3.0V, I
OUT
=10mA : unless otherwise specified. (See Typical Application)
*
1 ) Adjustable by external resistors (to 30V).
*
2 ) Supply current for DC/DC1. Supply current for VD or external resistors are excluded.
*
3 ) Standby current includes supply current for DC/DC1, 2 and VD.
V
DD
=3.0V, Topt=25C
ELECTRICAL CHARACTERISTICS
RV5VH301
DC/DC Converter 1
RV5VH3
36
DC/DC Converter 2
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
SET2
Output Voltage Setting 1
*
1
0
V
V
FB2
Feed Back Volatage 1
20
0
20
mV
V
IN
max
Maximum Input Voltage
10
V
V
OPT
min
Minimum Operating Voltage
Specified as the V
DD
1.8
V
Voltage for Device Operation
I
SS21
Supply Current21*
2
CSW="H", FB2=0.1V
15
60
A
I
SS22
Supply Current22*
2
CSW="H", FB2=0.1V
4
A
I
EXT2H
EXT2 "H" Output Current
V
EXT2
=V
DD
0.4V
2
4
mA
I
EXT2L
EXT2 "L" Output Current
V
EXT2
=0.4V
4
8
mA
fosc
Maximum Oscillator Frequency
110
130
150
kHz
Maxdty
Oscillator Duty Cycle
ON (V
EXT2
="L")
40
50
60
%
V
FB2
Feed Back Voltage Temp.Coefficient
40C
Topt
85C
30
V/C
Topt
*
) V
DD
=3.0V : unless otherwise specified. (See Typical Application)
*
1 ) Adjustable by external resistors (to -30V).
*
2 ) This value shows only the supply current of DC/DC2, not include the supply current of external resistors.
V
DD
=3.0V, Topt=25C
37
RV5VH3
Voltage Detector
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
DET
Detector Threshold
2.633
2.700
2.767
V
V
HYS
Detector Threshold Hysteresis
0.081
0.135
0.189
V
I
SS3
Supply Current3*
1
1.2
A
V
IN
max
Maximum Input Voltage
10
V
V
OPT
min
Minimum Operating Voltage
Specified as the V
DD
1.8
V
Voltage for Device Operation
I
OUT
Output Current
V
DS
=0.5V, V
DD
=1.5V
1.0
2.0
mA
V
DS
=0.5V, V
DD
=3.0V
4.0
5.0
mA
t
PLH
Output Delay
100
s
V
OUT1
Detector Threshold Temp.Coefficient
40C
Topt
85C
100
ppm/C
Topt
I
DOUTleak
D
OUT
Leakage Current
0.03
0.5
A
*
) V
DD
=3.0V : unless otherwise specified.
*
1 ) This value only shows the supply current of voltage detector.
V
DD
=3.0V, Topt=25C
RV5VH3
38
OPERATION
DC/DC Converter 1
The DC/DC1 can operate by an input voltage to the V
DD
pin. A change in the V
OUT1
will feed back to the internal error
amplifier through external voltage setting resistors and internal feed back resistors. When the feed back voltage is lower
than the reference voltage, the error amplifier enables oscillation or otherwise, it will stop oscillation. The internal feed back
resistor "R" which is fixed and adjusted by laser trim can make the feed back input voltage to "Error Amp.1" stable.
Pulses from the "OSC" circuit have a duty cycle of 50% and it becomes 65 to 75%(at high side) through the "P_shift" circuit.
These clock pulses control VFM circuit and make it possible to operate as a boost converter.
The output of "EXT1" is driven by CMOS buffer and an external NMOS driver is also available instead of an NPN transis-
tor, in such cases the Rb and the Cb are not necessary. The DC/DC1 can be shut down by CSW pin. When the CSW pin
is "H", V
DD
level, the DC/DC1 is enabled and when the CSW pin is "L", GND level, the DC/DC1 is disabled. The EXT1
pin outputs "L" while the DC/DC1 is disabled.
Set Output Voltage DC/DC1
V
OUT1
is described as follows :
V
OUT1
: R1+R2=VFB1 : R2
DC/DC1 controls VFB1 to be a constant voltage,
V
OUT1
=VFB1
(R1+R2) / R2
thus, any output voltage of DC/DC1 can be set by changing R1 or/and R2.
Certain temperature coefficient of V
OUT1
can be set by using R1, R2 having such temperature characteristics.
FB1
EXT1
+
RV5VH3
Error Amp.1
VFM1
CSW
4
1
2
OSC
R2
R1
p_shift
C
L1
SBD
V
OUT1
V
IN
NPN Tr.
Cb
Rb
3
Vref
V
DD
39
RV5VH3
DC/DC Converter 2
The DC/DC2 can operate by an input voltage to the V
DD
pin. A change in the V
OUT2
will feed back to the internal error
amplifier through external voltage setting resistors. The V
REF
voltage should be provided from externally fixed power sup-
ply such as V
OUT1
.
When the feed back voltage to the Error Amp.2 is higher than the ground voltage, the error amplifier enables oscillation
otherwise, it will stop oscillation.
Pulses from the "OSC" circuit have a duty cycle of 50% and it makes VFM operation allowable.
There might be certain cases that the duty cycles become smaller temporarily at light load current. The output of "EXT2"
is driven by CMOS buffer operated V
DD
and GND.
A PMOS driver will be connected to the "EXT2" pin and its switching operation generates negative output voltage through
energy accumulated in an inductor.
The DC/DC1 can be shut down by CSW pin. When the CSW pin is High, V
DD
level, the DC/DC1 is enabled and when the
CSW pin is "L", GND level, the DC/DC1 is disabled. The EXT2 pin outputs "H" while the DC/DC2 is disabled.
Set Output Voltage DC/DC 2
V
OUT2
is described as follows:
V
REF
: R1=|V
OUT2
| : R2
The FB2 voltage is controlled to 0V and V
REF
is provided externally
|V
OUT2
|=V
REF
R2/R1,
thus, any output voltage of DC/DC2 can be set by R1 and R2.
Certain temperature coefficient of V
OUT2
can be set by using R1, R2 having such temperature characteristics.
C1
L
FB2
V
OUT2
V
DD
EXT2
+
RV5VH3
Error Amp.2
VFM2
CSW
6
1
7
SBD
+
PMOS
OSC
C2
R2
R1
V
REF
RV5VH3
40
D
OUT
RV5VH3
Pull-up
Output Tr.
+
Vref
R1
R2
R3
Tr.1
3
8
V
DD
The Voltage Detector can operate by an input voltage to the V
DD
pin. The detector threshold and the reset voltage
are internally adjusted by trimmed resistors and the VD monitors V
DD
pin voltage.
The D
OUT
is Nch open-drain output and a pull up resistor is necessary.
Oepration Diagram
The output is pulled up to V
DD
voltage
Voltage Detector
A
B
Reset Voltage
Detector Threshold
GND
GND
Output Voltage
1 2 3 4 5
Hysteresis Range
+V
DET
V
DET
Step
Step 1
Step 2
Step 3
Step 4
Step 5
Comparator(+) Pin
Input Voltage
A
B
B
B
A
Comparator Output
H
L
L
L
H
Tr. 1
OFF
ON
ON
ON
OFF
Output Tr.
OFF
ON
Indefinite
ON
OFF
Step 1. Output Voltage is equal to Pull-up Voltage
Step 2. When Input voltage(V
DD
) reaches to the state of V
REF
V
DD
(R2+R3)/(R1+R2+R3) at point A, the output of the comparator is reversed, so that the
output voltage becomes to GND.
Step 3. Output Voltage becomes indefinite when Power Source Voltage (V
DD
) is smaller than Minimum Operating Voltage. When the output is pulIed up,
Output becomes pull-up voltage and GND.
Step 4. Output Voltage becomes to GND.
Step 5. When Input voltage(V
DD
) reaches to the state of V
REF
V
DD
R2/(R1+R2) at point B, the output of the comparator is reversed, so that the output voltage
becomes to pull-up voltage.
A :
R2+R3
V
DD
R1+R2+R3
B :
R2
V
DD
R1+R2+R3
41
RV5VH3
TYPICAL APPLICATION 1
CSW
FB1
V
DD
EXT1
D
OUT
FB2
EXT2
GND
Output DC/DC 2
Output DC/DC 1
C2
L2
PMOS
R3
R1
R2
C3
SBD
C1
NPN Tr.
SBD
R6
R4
C4
R5
C5
L1
CoiI
L1 : 100H, L2 : 100H
Diode
Schottky type
capacitor
C1 : 22F(Ta), C2 : 22F(Ta)
C3 : 0.01F (ceramic)
C4 : 0.01F (ceramic)
C5 : 0.01F (ceramic)
PMOS
2SJ238 (TOSHIBA)
NMOS
2SK1470 (SANYO)
Resistor
R1 : 100k
, R2 : 0 to 500k
R3 : 100k
R4 : 300
R5 : 0 to 500k
,
R6 : 50k
RV5VH3
42
CSW
FB1
V
DD
EXT1
D
OUT
FB2
EXT2
GND
C2
L2
PMOS
R3
R1
V
IN
R2
C3
SBD
C1
NPN Tr.
SBD
R6
R4
C4
R5
C5
L1
Output DC/DC 2
Output DC/DC 1
TYPICAL APPLICATION 2
CoiI
L1 : 100H, L2 : 100H
Diode
Schottky type
capacitor
C1 : 22F(Ta), C2 : 22F(Ta)
C3 : 0.01F (ceramic)
C4 : 0.01F (ceramic)
C5 : 0.01F (ceramic)
PMOS
2SJ238 (TOSHIBA)
NPN Tr.
2SD1628G (SANYO)
Resistor
R1 : 100k
, R2 : 0 to 500k
R3 : 100k
R4 : 300
R5 : 0 to 500k
,
R6 : 50k
Description
Step up DC/DC converter : DC/DC1
The oscillator can operate when CSW is "H". When the CSW is "L" the EXT1 outputs GND.
The output voltage can be adjusted by R5 and R6 with FB1 of two volt.
Invering DC/DC converter : DC/DC2
The oscillator can operate when CSW is "H". When the CSW is "L" the EXT2 outputs V
DD
.
The output voltage can be adjusted by R1 and R2 with FB2 of zero volt.
VoItage Detector
V
DD
pin can be monitored. This could be always operated with V
DD
.
The D
OUT
pin outputs "L" when low voltage is detected with Nch open-drain output.
43
RV5VH3
CSW
FB1
V
DD
EXT1
D
OUT
FB2
EXT2
GND
C2
L2
R3
R1
R2
C3
SBD3
C1
PNP Tr.
SBD1
R6
R5
C5
L1
R4
C4
NMOS
PMOS
V
IN
SBD2
Output DC/DC 2
Output DC/DC 1
R1 : 820k
, R2 : 820k
, R3 : 100k
, R4 : 1k
, R5 : 750k
(AdjustabIe)
R6 : 100k
L1 : 68H, L2 : 27H
C1 : 22F, C2 : 22F, C3 : 1000pF, C4 : 2200pF, C5 : 1000pF
PMOS : 2SJ238, NMOS : 2SK1470, PNPTr. : 2SB1120F
Operation
The V
DD
voltage can be supplied from another source than battery output and a reference voltage for DC/DC2 is
supplied by the output of DC/DC1.
The PMOS transistor can operate as a switch when the CSW is "L".
Step up DC/DC converter : DC/DC1
The oscillator can operate when CSW is "H". When the CSW is "L" the EXT1 outputs GND.
The output voltage can be adjusted by R5 and R6 with FB1 of two volt.
Invering DC/DC converter : DC/DC2
The oscillator can operate when CSW is "H". When the CSW is "L" the EXT2 outputs V
DD
.
The output voltage can be adjusted by R1 and R2 with FB2 of zero volt.
VoItage Detector
V
DD
pin can be monitored. This could be operated all the time by V
DD
.
The D
OUT
pin outputs "L" when low voltage is detected with Nch open-drain output.
TYPICAL APPLICATION 3
RV5VH3
44
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current
25
15
10
5
5
15
20
10
20
0
25
Output Current I
OUT
(mA)
Output Voltage V
OUT
(V)
0
10
20
V
IN
=3.6V
100
90
80
70
60
50
40
30
20
Output Current I
OUT
(A)
Efficiency
(%)
0.0001
0.001
0.01
0.1
V
IN
=3.6V
20V
15V
10V
V
OUT
5.0V
2) Efficiency vs. Output Current
3) CSW Load Transient Responce 1
20
15
0
10
5
5
15
10
20
Time t(ms)
Output Voltage V
OUT
(V)
50
0
50
100
150
200
V
IN
=3.6V, I
OUT
=1mA
V
OUT1
V
OUT2
CSW
20
15
0
5
10
5
10
15
20
Time t(ms)
Output Voltage V
OUT
(V)
0
500
1000
1500
V
IN
=3.6V, I
OUT
=1mA
V
OUT1
CSW
V
OUT2
4) CSW Load Transient Responce 2
*
) Please refer to Typical Application.
45
RV5VH3
SELECTION GUIDE
The output voltage, the type of DC/DC1 and the taping type for the ICs can be selected at the user's request.
The selection can be made by designating the part number as shown below:
RV5VH
Part Number
a b
c
}
}
Code
Contents
DC/DC1 type
a
1 : Internal L
X
Driver Transister Type
2 : External EXT Driver Transister Type
3 : Variable Output Voltage Type
b
Serial (01, 02, 03) Number of Setting DC/DC1 Output Voltage and Setting VD Detect Voltage.
c
Designation of Taping type
Ex. E1, E2 (refer to Taping Specifications, E2 type is prescribed as a standard.)
RV5VH3
46
APPLICATION HINTS
When using these ICs, be sure to take care of the following points.
Set external components as close as possible to the IC and minimize the connection between the
components and the IC. In particular, when an external component is connected to VOUT Pin, make
minimum connection with the capacitor.
Make sufficient grounding. A large current flows through GND Pin byswitching. When the impedance
of the GND connection is high, the potential within the IC is varied by switching current. This may
result in unstableoperation of the IC.
Use capacitor with good high frequency characteristics such as tantalum capacitor, aluminium
electrolytic capacitor and ceramic capacitor. We recommend the use of a capacitor with an allowable
voltage which is at least three times the output set voltage. This is because there may be the case
where a spike-shaped high voltage is generated by the inductor when Lx transistor is turned OFF.
Take the utmost care when choosing an inductor. Namely, choose such an inductor that has
sufficiently small d.c. resistance and large allowable current, and hardly reaches magnetic saturation.
When the inductance value of the inductor is small, there may be the case where ILX exceeds the
absolute maximum ratings at the maximum load. Use an inductor with an appropriate inductance. (See
OUTPUT CURRENT and SELECTION OF PERIPHERAL COMPONENTS sections.)
Use a diode of a Schottky type with high switching speed, and also take care of the rated current. (See
OUTPUT CURRENT and SELECTION OF PERIPHERAL COMPONENTS sections.)
The performance of power source circuits using these ICs largely depends upon the peripheral components. Take
the utmost care in the selection of the peripheral components. In particular, design the peripheral circuits in such
a manner that the values such as voltage, current and power of each component, PCB patterns and the IC do not
exceed their respective rated values.
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